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二力平衡是力学的重要知识之一,要正确理解和应用二力平衡知识,必须注意以下几点.1.二力平衡的条件:彼此平衡的两个力必须同时满足四个条件:大小相等、方向相反、作用在一条直线上、作用在同一个物体上,即同体、等值、反向、共线.2、平衡力与相互作用力的异同:两者的相同点是:大小相等、方向相反、作用在一条直线上;两者的不同点是:相互作用力的受力物体是两个物体,即作用在两个不同的物体上;平衡力的受力物体是同一物体,即作用在同一物体上.
Two-force balance is one of the important knowledge of mechanics. To correctly understand and apply the two-force balance knowledge, the following points must be noted: 1. Two-force balance conditions: Two forces that balance each other must satisfy four conditions at the same time: equal in size In the opposite direction, acting on a straight line, acting on the same object, ie, the same body, equal value, reverse, collinear. 2. The similarities and differences between the balance force and the interaction force: the similarity of the two is: the same size, In the opposite direction and acting on a straight line; the difference between the two is that the force object of the interaction force is two objects, that is, it acts on two different objects; the force object of the balance force is the same object, that is, the effect On the same object.